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HTTP/2 is a new version of the popular protocol that is for communication between the web server and the browser. It is a lower level technology than Drupal, so taking HTTP/2 into use does not require any modifications to your application or installation of Drupal modules. Drupal 8 introduces the request-response model to Drupal developers, but on a higher level - this is not to be confused with HTTP/1.1 vs. HTTP/2.